From 4206b022b6137aba08d6efcb2a907fdd12570081 Mon Sep 17 00:00:00 2001
From: Elad <18193363+elad335@users.noreply.github.com>
Date: Thu, 31 Oct 2024 20:29:10 +0200
Subject: [PATCH] Win32/File.cpp: Use ReplaceFile for hardlink overwrite

---
 Utilities/File.cpp | 28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/Utilities/File.cpp b/Utilities/File.cpp
index b73be0a8cf..89d53f9407 100644
--- a/Utilities/File.cpp
+++ b/Utilities/File.cpp
@@ -2490,7 +2490,8 @@ bool fs::pending_file::commit(bool overwrite)
 
 	const auto ws1 = to_wchar(m_path);
 
-	const HANDLE file_handle = CreateFileW(ws1.get(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
+	const HANDLE file_handle = !overwrite ? INVALID_HANDLE_VALUE
+		: CreateFileW(ws1.get(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
 
 	while (file_handle != INVALID_HANDLE_VALUE)
 	{
@@ -2551,6 +2552,12 @@ bool fs::pending_file::commit(bool overwrite)
 		CloseHandle(file_handle);
 		break;
 	}
+
+	if (!hardlink_paths.empty())
+	{
+		// REPLACEFILE_WRITE_THROUGH is not supported
+		file.sync();
+	}
 #endif
 
 	file.close();
@@ -2558,14 +2565,19 @@ bool fs::pending_file::commit(bool overwrite)
 #ifdef _WIN32
 	const auto ws2 = to_wchar(m_dest);
 
-	if (MoveFileExW(ws1.get(), ws2.get(), overwrite ? MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH : MOVEFILE_WRITE_THROUGH))
-	{
-		for (auto&& path : hardlink_paths)
-		{
-			// Recreate hard links
-			CreateHardLinkW(path.c_str(), ws2.get(), NULL);
-		}
+	bool ok = false;
 
+	if (hardlink_paths.empty())
+	{
+		ok = MoveFileExW(ws1.get(), ws2.get(), overwrite ? MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH : MOVEFILE_WRITE_THROUGH);
+	}
+	else
+	{
+		ok = ReplaceFileW(ws1.get(), ws2.get(), nullptr, 0, nullptr, nullptr);
+	}
+
+	if (ok)
+	{
 		// Disable the destructor
 		m_path.clear();
 		return true;